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A Refinement-Based Validation Method for Programmable Logic Controllers

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4 Author(s)
Hai Wan ; Key Lab. for ISS of MOE, Tsinghua Univ., Beijing, China ; Xiaoyu Song ; Gang Chen ; Ming Gu

Programmable logic controllers (PLCs) are widely used in computer-based industrial applications. Timers play a pivotal role in PLC real-time embedded system applications. The paper addresses the formal validation of PLC systems with timers in the theorem proving system Coq. The timer behavior is characterized formally. A refinement validation methodology is presented in terms of an abstract model and a concrete model. The refinement is calibrated by a mapping relation. The soundness of the methodology is shown in the proving system. An illustrative case study demonstrates the effectiveness of the approach.

Published in:

Quality Software (QSIC), 2010 10th International Conference on

Date of Conference:

14-15 July 2010